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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 22 |
| 3 | 474 |
| 4 | 15512 |
| 5 | 685450 |
| 6 | 38251212 |
| 7 | 2582466950 |
| 8 | 204744089104 |
| 9 | 18650699228754 |
| 10 | 1919767092675860 |
| 11 | 220378941471652942 |
| 12 | 27916112634179586456 |
| 13 | 3868191824049865945178 |
| 14 | 582034397153512353488284 |
| 15 | 94509039130326185624148150 |
| 16 | 16472375319790734221438146592 |
| 17 | 3067435511995844132675459958178 |
[1,2,22,474,15512,685450,38251212,2582466950, 204744089104,18650699228754,1919767092675860, 220378941471652942,27916112634179586456, 3868191824049865945178,582034397153512353488284, 94509039130326185624148150, 16472375319790734221438146592, 3067435511995844132675459958178] |